Sewing machine



March 27, 1951 R. CASAS ROBERT SEWING MACHINE Filed March 5l, 1.949

Patented Mar. 27, 1951 SEWING MACHINE Ramon Casas Robert, Geneva,Switzerland, as-

signor to Melina S. A., Binningen, Switzerland, a. corporation ofSwitzerland Application March 31, 1949, Serial No. 84,603 In SwitzerlandDecember 20, 1948 2 Claims. 1

The object of the present invention is a sewin machine comprising acasing having two principal parts including a vertical column and anapproximately horizontal arm in which is mounted the mechanism foractuating the needle carrier and thread puller located at the free endof the arm.

Machines of this type generally have at their upper portion a supportfor a spool of thread adapted to be directed either through a threadguide to the needle or through another thread guide back to a bobbinWinding support.

In order that the unwinding of the threa from the spool during sewingmay be easily effected without the spool being vertically displaced onits support, it is necessary that the distance between the spool supportand the thread guide leading the thread to the needle be large andcorrespond substantially to the length of the arm of the machine.

On the other hand in order that the winding of the thread on the bobbinbe uniformly distributed over the length of the bobbin, it is necessarythat the bobbin winding support be spaced as far as possible from thethread guide through which the thread coming from the spool passes.

In the prior art sewing machines, the device for winding the bobbin isgenerally located near the column carrying the arm of the machine, andthis column generally contains the driving mechanism of the machine orthe driving mechanism is located near this column.

There have also been in the prior art constructions comprising a spoolsupport located on the highest part of the machine and a bobbin windingdevice positioned in a recess of the casing of the machine in closeproximity at the side of this support. By reason of the small distancebetween the spool and the bobbin winding device, it is impossible inpractice to effect the proper winding of the thread on the bobbin inspite of the use of means bearing on the convolutions of the thread. Asthe bobbin becomes filled. the less end windings are made and thesurface of the full winding on the bobbin becomes convex.

From the foregoing, it results that generally if the position of thespool support is advantageous for the sewing because of the distancebetween the spool, and the thread guide leading the thread to theneedle, corresponds to the length of the arm, this position is lessadvantageous for the winding of the bobbin since the distance betweenthe thread and the bobbin is necessarily much smaller. This is thereason why certain manufacturers have provided two spool supports on themachine, one for the bobbin thread and one for the needle thread.

The object of the present invention is to provide a construction inwhich the spool support is so located relative to theI bobbin windingdevice that the prior art disadvantages pointed out above are avoided. Y

According to the present invention, the spool support andv the bobbinwinding device are positioned near each other, on the upper portion ofthe column, and the two thread guides, one for the thread when it is ledto the needle and the other for the thread when it is led to the bobbin,are positioned at the free end of the arm of the machine.Thisconstruotion insures that the distance between the spool of threadand the needle'- thread-guide corresponds practically to the length ofthe arm and the distance between the bobbin-thread-guide and the spool,and also the distance between the bobbin-thread-guide and the bobbinwinding device are practically equal to the length of the arm.

The attached drawing shows diagrammaticall and by way of example a formof execution of the sewing machine in accordance with the invention. v

Fig. 1 is a part view of the front wall of the casing.

Fig. 2 is a part view of the rear wall of the casing.

Fig. 3 is a top View of the casing.

Like other known sewing machines, the one represented on the attacheddiagrammatical drawing includes a casing having two main partsconsisting of a column I bearing an arm 2. At the end of the latter aremounted a needle-carrier 3 and a thread-puller 4, both driven in .a toand fro movement by transmission and driviing mechanisms connected to amotor.' All these mechanical elements are housed within the casing andare therefore not visible 4on the attached drawing. However, thearrangement y of the transmission organs, their generalshap'es and theirdistribution in the space have been specially studied with a, view toachieving a casing with simple lines pleasing to the eye. In particular,the form of this casing has been chosen and studied so as to avoid thenecessity of adding to its rear wall a support for the reel or for thereels.

For this purpose, the rear wall of the column has a flat spot, situatedat the height of the arm 2 and limited by an extension 6 of the rearwall of the arm, on the one hand, and by a, linking Wall 'l connectingthe said extension to the rear 8 'and upper 9 walls of the column on theother hand. This spot 5 is provided with two fixed axles I and II eachintended to receive a reel I2, I3. In the case when, as represented onthe drawing, the distance between the rear walls 8 and I4 of the columnand of the arm is smaller than thediameter of va spool, .the said kflatspot can be extended towards the outside ,by a bracket I5 cast with thecasing.

This arrangement not only has the advantage of enabling one to achieve acasing of elegant shape, in which the reel support is cast as a part ofthe casing, which eliminatesmounting operations, but moreover makesitpossible to provide a particularly advantageous path for the thread.Indeed, as shown on the drawing, the arm is fitted, at its outer or freeend, with a threadguide I6, so that the thread portion y, situa-tedvbetween the spool and the thread-guide,;is almost parallel with the rear'wall I4 of the arm and close to this. Thus, this thread portion isemcientlysafeguarded against any `danger of Vaccidental damage.

In addition, the Iwall '5 being situated in the extension of the wallI4, it is quite natural to Farrange the upper wall ,Il of the column inthe extension of the upper wall I8 of ,the arm, as Cshown on thedrawing. One obtains then, Afor rthe whole of this part of ,the casing,extremely i-simple forms, easy to achieve by moulding cor Istamping. Theupper walls I'I `and I8 are preferably in the shape of circularhalf-eylinders, which enables `one to ,avoid any angle between .therearand upper walls kof the casing, andoers -thencthepossibilityofproyiding a windinggdevice i for "the .bobbin Yhousf-:d inside ,thecolumn and ,having an axle I9 intended to drive a bobbin .2li .andemerging from `the upper wall of the column, with `a V-shaped threadvpath 2l, 22 between the said bobbin ,and the reel, of suicient lengthto .avoid the need of providing the winding device ofthe bobbin with amobile thread guide, eifecting a to and fro movement of `which theextent `correspionds to the winding length ofthe bobbin.

Indeed, by placing a fixed guidingelement .23 at the end 0f the arm, asuicient length of the thread portionZZ is obtained to form on thebobibin a cylindrical or only a very slightly curved winding. But, inorder .toenable the thread to run over the V-shaped path 2l, 22, it isobvious that the casing ycannot have rear and upper walls forming anangle between themselves, because 'the ,thread would then rub on thisangle, which Would risk `damaging it or at least quickly-wear- Jing offthe casing part in Contact with the thread. On the contrary, with thesewing machine represented, Lthe two thread sections ZI and 22 `arealmost parallel with the walls of the casing.

`lThe.arrangement,described is thus an extreme- "ly advantageous oneowing to the fact that it Yenables, the winding device for the bobbin tobe Vpsimpliiiedin amarked way, whilst procuring .the ,possibility of`achieving a casing of simple, elegant shape and requiring only aminimum number of machining and mounting operations.

I claim:

l. A sewing machine comprising a casing having two principal partsconsisting of a vertical column and an approximately horizontal canti-,leVer arm, a lthread pullei` Vand a v needle carrier vfor carrying ,aneedle,'b,oth;mounted at the free end of said arm, mechanism in said armfor actuating the needle carrier and thread puller, a thread spoolsupport mounted on the upper rear surface of the column, a bobbinwinding device mounted on the ,uppermost portion of the arm in closeproximity to the spool support, a needle- :thread-guidemounted on therear surface of the arm at the free end thereof for guiding thread fromthe l'spool "to the needle, and a bobbinrtl'xread-guide also mountedy onthe rear surface of the kfree end of the arm above theneedlethread-guide so that the distance between the spoolsupport and thebobbin-thread-guide and the distance between the bobbin-thread-guide andthe ,bobbin winding device are each practically equal to the length ofthe arm thereby facilitating bobbin winding,

2. A sewingmachine comprising a casing having two principal partsconsisting of a vertical column and an approximately horizontalcantileverarm, a thread puller and a needle carrier for carrying aneedle, both-mounted at the free .end of said arm, mechanism in said armfor actuating the needle lcarrier and thread puller, a

lthread spool support mounted on the upper rear vsurface Yof the column,a bobbin winding device mounted on the uppermost Vportion of the arm inclose proximity Vtothe spool support, said bohbin winding mechanismincluding a rotary shaft projecting through the upper wall of thecasing, a ',needle-,thread-guide mounted on the rear surface of the armat the free end thereof for guiding thread from the spool 'to theneedle, and a bObbin-thread-guide also mounted on the rear surface ofthefree end of the arm above the nee- Vdle-thread-guide so that thedistance between the spool support and the bobbin-thread-guide and thedistance between the bobbin-threadguide and the 'bobbin winding deviceare each practically equal to the length of thearm thereby facilitatingbobbin winding.

RAMON CASAS ROBERT.

REFERENCES CITED The `following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,681,559 Stephenson Aug. 21I1928 2,220,969 List et al Nov. l2, 1940 `2,390,571 Colgrove ,Dec. ll,1945 FOREIGN PATENTS 'Number Country Date 59,394 Norway May 23, 1938

